Hydronic zone controller



FIG. 1 is a perspective view of a fourth embodiment of the hydronic zone controller;

FIG. 2 is a front elevation view of the fourth embodiment of the hydronic zone controller of FIG. 1;

FIG. 3 is a front elevation view of the fourth embodiment of the hydronic zone controller of FIG. 1 with user interface elements added; and,

FIGS. 4-7 are left, right, top and bottom views, respectively, of the fourth embodiment of the hydronic zone controller of FIG. 1.

The portions illustrated in broken lines on the figures are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a hydronic zone controller, as shown and described. 